Peonies are one of the few flowers you can plant once and enjoy for generations. Their big, fragrant blooms show up in late spring, and a healthy clump can live 50 to 100 years.
Getting a few details right at the start makes all the difference.
This guide covers how to plant peonies step by step, from picking the right type to setting the roots at the correct depth. I’ll also cover spacing, feeding, staking, winter care, and the common problems that keep peonies from blooming.
Choosing Peony Types: Herbaceous, Tree and Itoh
The three main peony types are herbaceous, tree, and Itoh. Herbaceous peonies are the most common and easiest for beginners. Tree and Itoh types offer different shapes and bloom habits.
Before you shop, gather a few basics. A bag of compost and a sturdy garden fork will handle most of the soil prep for any peony type.
Herbaceous Peonies
Herbaceous peonies (Paeonia lactiflora and its hybrids) die back to the ground each fall. They regrow from the roots every spring. They grow in USDA zones 3 to 8.
These peonies need winter chilling to bloom. If you garden in zone 8 or warmer, pick early-blooming varieties. Early bloomers open before late-spring heat arrives, which gives them a better shot at flowering.
Popular named varieties include ‘Sarah Bernhardt’, ‘Festiva Maxima’, and ‘Bowl of Beauty’. My advice is to start here if you’re new to peonies.
Tree Peonies
Tree peonies are woody shrubs. Their stems stay above ground all winter and don’t get cut back in fall. They grow slowly but develop into large, long-lived shrubs.
Tree peonies are planted differently from herbaceous types. Most are grafted, and the graft union goes 4 to 6 inches below the soil. I’ll cover that in the depth section below.
Itoh (Intersectional) Peonies
Itoh peonies are crosses between herbaceous and tree peonies. They have the sturdy stems and leaves of a tree peony but die back like an herbaceous type. Their stems tend to hold blooms upright better.
Itohs work well in mixed beds and large containers. If you like to design pots, my list of 15 gorgeous container plant combinations can spark ideas for what to grow alongside them.
| Type | Above-ground growth | Fall cutback | Planting depth |
|---|---|---|---|
| Herbaceous | Dies back each year | Cut to ground | Eyes 1–2 inches deep |
| Tree | Woody, stays all winter | No | Graft union 4–6 inches deep |
| Itoh | Dies back each year | Cut to a few inches | Eyes 1–2 inches deep |
The Best Time to Plant Peonies
The best time to plant bare-root peonies is early fall, September to October. Aim for about 6 weeks before the ground freezes. Potted peonies can also go in during spring.
Why Early Fall Works Best
Fall planting gives roots time to settle in while the soil is still warm. The tops are dormant, so the plant puts its energy into root growth. By spring, it’s ready to send up shoots.
Spring Planting for Potted Peonies
Nursery peonies sold in pots can be planted in spring. They already have an established root system. Plant them as soon as the soil is workable and keep them watered through their first summer.
Spring-planted bare roots can work, but they often struggle more. If you buy bare roots in spring, plant them quickly and expect slower growth the first year.
Timing by Region
Your local first frost date is the best guide. Count back about 6 weeks from when your ground usually freezes.
| Region | Typical fall planting window |
|---|---|
| Northern zones 3–5 | Early to mid-September |
| Middle zones 6–7 | Late September to October |
| Warmer zone 8 | October to early November |
Finding a Sunny Spot and Preparing the Soil
Peonies need full sun, at least 6 hours daily. They also need well-drained, fertile soil with a pH of about 6.5 to 7.0. Pick your spot carefully, because peonies dislike being moved.
Choosing the Right Location
Look for a spot with morning and afternoon sun. Shade is one of the top reasons peonies grow leaves but no flowers. Avoid planting near large trees or shrubs that compete for light and water.
Good airflow matters too. Don’t tuck peonies into a tight corner against a wall. Open air helps leaves dry and cuts down on disease.
Because peonies can live for decades, think long term. Choose a place you won’t want to dig up in five years.
Testing and Adjusting Soil
A simple soil test tells you your pH. Peonies like soil near neutral, about 6.5 to 7.0. Slightly acidic soil can be adjusted with garden lime, following package directions.
Drainage is critical. Peony roots rot in soggy soil. If water puddles in your chosen spot after rain, pick another location or build a raised area.
Digging the Planting Hole
Dig a hole about 18 inches wide and 18 inches deep. Loosen the sides with a garden fork so roots can spread. Mix compost into the soil you removed.
The same prep steps you’d use to prepare soil for vegetable garden beds work well here. Loose, rich soil with plenty of organic matter is the goal.
If you have heavy clay or very sandy ground, it’s worth learning about the best soil for growing plants. Clay needs extra compost for drainage, while sand needs it to hold moisture and nutrients.
How Deep to Plant Bare-Root and Potted Peonies
Set the eyes no more than 2 inches below the soil surface in cold zones. In zones 7 and 8, plant them about 1 inch deep. Planting too deep is the most common reason peonies fail to bloom.
This is the most important step in learning how to plant peonies. Get the depth right, and most other problems become minor.
Planting Bare-Root Peonies
Bare-root peonies arrive as a clump of thick roots with small pink or red buds called eyes. These eyes become next year’s stems. Look for divisions with 3 to 5 eyes.
Follow these steps:
- Fill the prepared hole partway with your compost-amended soil.
- Make a small mound in the center.
- Set the root on the mound with the eyes facing up.
- Check the depth with a ruler or a stick laid across the hole.
- Fill in around the roots and firm the soil gently with your hands.
- Water deeply to settle the soil.
After watering, check the depth again. Soil often settles, and the root may sink. Add or remove soil so the eyes sit at the right level.
Planting Potted Peonies
For potted peonies, plant at the same level the plant grew in its container. Check that the eyes aren’t buried more than 2 inches. Some nursery pots have extra soil on top, so brush it back and look.
Slide the plant out, loosen any circling roots, and set it in the hole. Backfill, firm the soil, and water well.
Planting Tree Peonies
Tree peonies follow a different rule. Set the graft union 4 to 6 inches below the soil surface. This encourages the top part of the plant to grow its own roots over time.
The graft union usually looks like a slight swelling or line where the stem meets the rootstock.
| Peony type | Cold zones (3–6) | Warm zones (7–8) |
|---|---|---|
| Herbaceous eyes | No more than 2 inches | About 1 inch |
| Itoh eyes | No more than 2 inches | About 1 inch |
| Tree peony graft union | 4–6 inches | 4–6 inches |
Spacing Peonies for Airflow and Long Life
Space herbaceous peonies 3 to 4 feet apart. This gives each plant room to fill out and keeps air moving through the leaves.
Why Spacing Matters
A young peony looks small, but mature clumps get wide. Crowded plants hold moisture in their leaves, which invites botrytis blight and powdery mildew. Good spacing is one of your best disease-prevention tools.
Spacing also cuts competition. Peonies planted too close fight for water, nutrients, and sun.
Spacing Near Other Plants
Keep peonies a few feet from aggressive spreaders and big shrubs. Low companions like catmint, salvia, and alliums work well nearby. Just keep them from crowding the peony crown.
Tree peonies need more room as they mature. Give them 4 to 5 feet so the woody shrub can spread.
Growing Peonies in Containers
Peonies grow best in the ground, but Itoh and compact herbaceous types can live in large containers. Choose a pot at least 18 inches wide and deep with drainage holes.
Container peonies still need full sun and winter chilling. They suit sunny patios, and they pair well with other choices in my guide to the best plants to grow on a balcony.
In cold zones, move the pot to an unheated garage or shed for winter so the roots don’t freeze solid.
Watering, Mulching and Feeding Peonies
Water well after planting and give about 1 inch of water per week in dry spells. Mulch lightly the first winter. Feed sparingly, because too much nitrogen means leaves instead of flowers.
